Assessing the impact of subsequent strokes on the lightning performance of transmission lines of 138 kV

Author

Silveira, Fernando H. ; Visacro, Silvério ; De Souza, Ronaldo E. ; De Conti, Alberto

Author_Institution

LRC - Lightning Res. Center, UFMG - Fed. Univ. of Minas Gerais, Belo Horizonte, Brazil

fYear

2012

fDate

2-7 Sept. 2012

Firstpage

1

Lastpage

5

Abstract

The Hybrid Electromagnetic Model was used systematically to determine lightning overvoltages across insulator strings due to direct strikes to the tower top in order to assess the importance of subsequent strokes on backflashovers for 138-kV transmission lines. It was found that for some specific conditions, especially for lines with high towers and low tower-footing grounding resistances, subsequent strokes may be a relevant source of lightning outages.

Keywords

computational electromagnetics; earthing; insulators; lightning protection; power overhead lines; power transmission protection; backflashover; high tower; hybrid electromagnetic model; insulator strings; lightning outage; lightning overvoltages; lightning performance; low tower footing grounding resistance; power transmission lines; subsequent lightning strikes; voltage 138 kV; Grounding; Insulators; Lightning; Poles and towers; Power transmission lines; Resistance; Surges; Grounding; Lightning overvoltage; Lightning parameters for engineering application; Lightning performance of transmission lines; Subsequent strokes;

fLanguage

English

Publisher

ieee

Conference_Titel

Lightning Protection (ICLP), 2012 International Conference on

Conference_Location

Vienna

Print_ISBN

978-1-4673-1898-3

Electronic_ISBN

978-1-4673-1896-9

Type

conf

DOI

10.1109/ICLP.2012.6344275

Filename

6344275